engleski

Use of carbocalk for improvement of soil fertility

Carbocalk is byproduct of sugar factory and is suitable for liming of the acid soils. In the autumn of 2000 two field experiments in four replicates were started with increasing rates of carbocalk application (0, 15, 30, 45 and 60 t ha-1). In these study yields of the field crops and cadmium (Cd) concentrations in the leaves and grains were shown. In the both experiments maize was grown total eight times (four years) and wheat four years. The lowest rate of applied carbocalk was adequate for the considerable both maize and wheat yield increases for 16% and 28%, respectively (maize 6.92 and 8.04 t/ha ; wheat 4.85 t/ha and 6.20 t ha-1). By the higher quantities of the carbocalk the yields were mainly low increased. Sunflower, sugar beet, barley and soybean were grown only one growing season and by liming the yields were increased for 48%, 43%, 30% and 8%, respectively. Cd concentrations in the leaves of tobacco were the considerable higher (mean 2.4 mg Cd kg-1) in comparison with those of maize (0.10 mg Cd kg-1) and soybean (0.15 mg Cd kg-1), while in grain of wheat and barley they were considerably lower (0.02 mg Cd kg-1). In general, liming considerably affected on decreases of Cd uptake by plants as follows: for 45% in tobacco leaves (3.6 and 2.0 mg Cd kg-1, for the control and mean of the carbocalk treatments, respectively, but only in one of two tested years). The correspondingly values for the leaves of maize were 0.16 and 0.08 mg Cd kg-1 (decrease for 52%) and for soybean 0.50 and 0.06 mg Cd kg-1 (decrease for 87%), respectively. In the third experiment, effects of liming with carbocalk were the lower, but considerable improved soil properties (for example, base saturation) as well as P and Ca uptake in maize and wheat.

carbocalk; liming; cadmium; yields of the field crops; the eastern Croatia

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